вош 2021 2

import java.util.Scanner;

class Main {
  public static void main(String[] args) {
    Scanner s = new Scanner(System.in);
    int a = s.nextInt();
    int b = s.nextInt();
    int c = s.nextInt();
    long n = s.nextLong();
    int last = s.nextInt();
    long spent = 0;
    spent = (n / 3) * (a + b + c);
    if(n % 3 != 0){
      if(last == 1) spent += a;
      else if(last == 2) spent += b;
      else if(last == 3) spent += c;
      for(int i = 0; i < n % 3 - 1; i++){
        if(last == 1){
          spent += b;
          last = 2;
        }
        else if(last == 2){
          spent += c;
          last = 3;
        }
        else if(last == 3){
          spent += a;
          last = 1;
        }
      }
    }
    System.out.print(spent);
  }
}